Hi Sue and Robert:
Sue, there have been posts from people who have cruised with Singles cruises. Looks like they get groups of 100-200 people (singles) together mostly out of Florida on Carnival. I figure I'll probably try them sometime in the future if they do something out of LA since I live on the west coast.
Robert, do you mostly cruise solo? The reason I ask is I wonder if one can get better rates dealing directly with the cruise line. At least this method would be more direct.